The Pentax F9900 Wire Mesh Prescription Safety Glasses is a plastic frame with permanent Wire Mesh side shields. In other words, these oxidized, corrosion resistant Wire Mesh side shields provide ventilation, which helps to reduce fogging. Available in a smoke frame in 2 different sizes, these Pentax Safety Glasses are prescription available. Plus, the Pentax F9900 Wire Mesh Prescription Safety Glasses meet the ANSI Z87.1 industry standards. For more options check out our Pentax Safety Glasses collection.